dsp.js - Digital Signal Processing for Javascript

•    Javascript

DSP.js is a comprehensive digital signal processing library for javascript. It includes many functions for signal analysis and generation, including Oscillators (sine, saw, square, triangle), Window functions (Hann, Hamming, etc), Envelopes (ADSR), IIR Filters (lowpass, highpass, bandpass, notch), FFT and DFT transforms, Delays, Reverb.

Tone.js - A Web Audio framework for making interactive music in the browser.

•    Javascript

Tone.js is a Web Audio framework for creating interactive music in the browser. The architecture of Tone.js aims to be familiar to both musicians and audio programmers looking to create web-based audio applications. On the high-level, Tone offers common DAW (digital audio workstation) features like a global transport for scheduling events and prebuilt synths and effects. For signal-processing programmers (coming from languages like Max/MSP), Tone provides a wealth of high performance, low latency building blocks and DSP modules to build your own synthesizers, effects, and complex control signals. Full Installation Instruction.

essentia - C++ library for audio and music analysis, description and synthesis, including Python bindings

•    Jupyter

Essentia is an open-source C++ library for audio analysis and audio-based music information retrieval released under the Affero GPL license. It contains an extensive collection of reusable algorithms which implement audio input/output functionality, standard digital signal processing blocks, statistical characterization of data, and a large set of spectral, temporal, tonal and high-level music descriptors. The library is also wrapped in Python and includes a number of predefined executable extractors for the available music descriptors, which facilitates its use for fast prototyping and allows setting up research experiments very rapidly. Furthermore, it includes a Vamp plugin to be used with Sonic Visualiser for visualization purposes. Essentia is designed with a focus on the robustness of the provided music descriptors and is optimized in terms of the computational cost of the algorithms. The provided functionality, specifically the music descriptors included in-the-box and signal processing algorithms, is easily expandable and allows for both research experiments and development of large-scale industrial applications. If you use example extractors (located in src/examples), or your own code employing Essentia algorithms to compute descriptors, you should be aware of possible incompatibilities when using different versions of Essentia.

librosa - Python library for audio and music analysis

•    Python

A python package for music and audio analysis. See http://librosa.github.io/librosa/ for a complete reference manual and introductory tutorials.

inspectrum - Offline radio signal analyser

•    C++

inspectrum is a tool for analysing captured signals, primarily from software-defined radio receivers. If an unknown file extension is loaded, inspectrum will default to *.cf32.

WebPd - Run your Pure Data patches on the web.

•    Javascript

WebPd is a 100% JavaScript Pure Data runtime using Web Audio API to play audio in the browser. It aims at allowing a subset of Pure Data programming language to run in the browser without plugins and with best possible performance. WebPd should be supported by all browsers supporting Web Audio API.

darkstar - FFXI Server Emulator

•    Lua

Welcome to the DarkStar project, an emulation server for FFXI. Visit our forums and Discord or IRC to keep in touch with the latest developments. Make sure both FFXI and the server are fully updated (and servers have been rebuilt with the latest code prior to the bug) or check the commit log since your last known update to see if the bug has already been fixed before submitting a new bug report (oh and remember to search to see if your issue has already been reported).

Soundpipe - A lightweight music DSP library.

•    C

Soundpipe is a lightweight music DSP library written in C. It aims to provide a set of high-quality DSP modules for composers, sound designers, and creative coders. More information on specific Soundpipe modules can be found in the Soundpipe module reference guide.

pyo - Python DSP module - ajaxsoundstudio.com

•    C

pyo is a Python module written in C to help digital signal processing script creation. pyo is a Python module containing classes for a wide variety of audio signal processing types. With pyo, user will be able to include signal processing chains directly in Python scripts or projects, and to manipulate them in real time through the interpreter. Tools in pyo module offer primitives, like mathematical operations on audio signal, basic signal processing (filters, delays, synthesis generators, etc.), but also complex algorithms to create sound granulation and others creative audio manipulations. pyo supports OSC protocol (Open Sound Control), to ease communications between softwares, and MIDI protocol, for generating sound events and controlling process parameters. pyo allows creation of sophisticated signal processing chains with all the benefits of a mature, and widely used, general programming language.

NVDSP - iOS/OSX DSP for audio (with Novocaine)

•    Objective-C

Implement high quality audio filters with just a few lines of code and Novocaine, or your own audio library of choice. To start out I recommend you to get a fresh copy of Novocaine and open Novocaine's excellent example project. Then import NVDSP and the Filters folder and start your filtering journey.

web-audio-api - Node.js implementation of Web audio API

•    Javascript

This library implements the Web Audio API specification (also know as WAA) on Node.js. By default, web-audio-api doesn't play back the sound it generates. In fact, an AudioContext has no default output, and you need to give it a writable node stream to which it can write raw PCM audio. After creating an AudioContext, set its output stream like this : audioContext.outStream = writableStream.

Wavelet Studio

•    CSharp

C# library to assist the signal processing with Wavelet Analysis.

iStudio

iStudio is an open source audio development platform aiming to become professional audio and signal processing suite with fully functional audio editor.

Vocal Remover - VST Plugin

•    C++

Removes vocal form songs using M/S system trick with EQ on mid signal. IDE: MS Visual C++ 2008 Express SDK: VST SDK v.2.4 Framework: JUCE

Realtime C# Pitch Tracker

Use the PitchTracker class to easily track the pitch of a waveform (typically from vocals). It is fast (~3000 detections/sec) and accurate (within 0.02% of the actual frequency). It is written in C#. A sample app is included.

DX7-Supercollider - My accurate Yamaha DX-7 clone. Programmed in Supercollider.

•    SuperCollider

You don't need to open the DX7.afx file. It just needs to be in the same directory as the DX7.scd. Just open the DX7.scd in Supercollider and run the big chunk of code starting from the line 35 and it's ready to use. Then run the mainCaller functions for new notes and to close notes send zero velocity from the mainCaller functions. The only requirement is to install the SC3-Plugins Ugen library because I use the FM7.ar Ugen at the heart of all operation.

gibberish - Fast, JavaScript DSP library that creates JIT optimized audio callbacks using code generation techniques

•    Javascript

Gibberish is designed to be a fast audio API for the browser. It takes the low-level building blocks provided by genish.js and uses them to create higher-level synthesizers, effects, and sequencers. Gibberish proceses each sample of each synthesis block one sample at a time, enabling a variety of effects not typically possible in browser-based synthesis systems, most importantly single-sample feedback loops and audio-rate modulation of scheduling. Note that this branch is for version 3 of the library. See the master branch for the pre-June 2017 version that is currently used in Gibber. There is also a tagged release of the older version (2.0.0).

periodic-function - List of periodic functions normalized to 0..1 range

•    Javascript

Collection of periodic functions with period normalized to turns.If you feel like it is not complete list of you know example of a good periodic function, suitable for dsp, welcome to contribute.

window-function - Collection of window functions

•    Javascript

Among other uses, window functions help control spectral leakage when doing Fourier Analysis. This collection of window functions is copied directly from Wikipedia. Caveat emptor.To calculate the value of a window function, pass the sample number and total number of samples to one of the window functions listed below, along with any additional parameters it may require. The plots below are calculated from the npm module and plotted with Fourier transform to illustrate the spectral leakage. See the Wikipedia page on window functions for more details.

fourier-transform - Minimalistic and efficient FFT implementation

•    Javascript

Minimalistic and efficient FFT implementation for 2n-size inputs. Includes regular and asm.js versions.To use asm.js version, require as require('fourier-transform/asm'). That is ~35% faster.